Pavement joint



May 1,9, 1942. A1 E. BRICKMAN 2,283,787

Y PAVEMENT JOINT l Filed Nov. 19, 1940 2 sheets-sheet 1 ff ff 7/ 1 May19, 1942.

A. E. BRICKMAN PAVEMENT JOINT 2 Sheets-Sheet 2 Filed Nov. 19, 1940Patented May 19, 1942 PAVEMENT JOINT Alan E. Brickman, Monongahela, Pa.,assignor to The American Steel and Wire Company of New Jersey, acorporation of New Jersey Application November 19, 1940, Serial No.366,307

Claims.

This invention relates to pavement joints, and more particularly tothose which are used in Y paving to compensate for the expansion andcontraction thereof. Pavement joints of the type described are nd ingextremely wide usage, but are subject to several deleterious factors andconsequently frequently present difficulties.

For a satisfactory pavement joint ofthe type to which the presentinvention appertains, attention is directed to Patent No. 2,201,823,dated May 21, 1940.

It is an object of the present invention to provide a joint for pavingwhich overcomes disadvantages of the devices of the prior art.

Another object is to effect better surface align- `ment of one pavementslab with the adjacent slab in the pavements cycles of expansion,contraction, warping, internal stress, subgrade variations, and wheelload.

A further object is the provision of a device of the class describedwhich is relatively easy and inexpensive to manufacture and install, andone which is at the same time very ecient and durable in service.

The foregoing and other objects will become apparent after referring tothe drawings, in which:

Figure 1 is a side elevation of the device of the present inventionshowing parts thereof in section:

Figure 2 is a plan;

Figure 3 is a view similar to Figure 1 but showing the relativepositions of the parts of the device of the present invention when theadjacent paving slabs have moved closer together;

Figure 4 is an end elevation;

Figure 5 is a perspective of a detail;

Figure 6 is a perspective of another detail.

Referring more particularly to the drawings, the numeral I generallydesignates the base member of the pavement joint of the presentinvention. More specically, the base member I takesv the form of amalleable iron or steel member having oppositely disposed extensions 2.Integrally formed on the base member I and in parallelism one withrespect to the other there is carried a pair of vertical uprights 3which provide reversely curved portions 4 extending toward each otherand terminating in elongated complemental vertical extensions 5. Asshown more clearly in Figures 1 and 3, the adjacent faces of theuprights 3 immediately below the reversely curved portions 4 providerod-receiving recesses 6, the function of which will be describedhereinafter. The upper ends of the complemental vertical extensionscarry oppositely extending horizontal portions 8 which are adapted to beimbedded in the adjacently disposed paving slabs which the joint of theinvention is adapted to connect. At the upright ends of the complementalvertical extensions 5, and on opposed adjacent surfaces thereof, thereare provided rodreceiving recesses 9 which are similar to therodreceiving recesses 6.

On each of the remote sides of the vertical uprights 3, reversely curvedportions 4 and complemental vertical extensions 5, there is carried acompressible element II which is provided with a cut-out portion I2 forstraddling theadjacent extensions 2 of the base member. Thesecompressible elements II also provide reversely curved portions I3 forconformity with the reversely curved portions 4 of the uprights 3, andtapered upper portions I4, one face of which contacts for a substantialdistance the adjacent surfaces of the vertical extensions 5.

'I'hrough each of the rod-receiving recesses 6 and 9 there is disposedto extend a rod I8, each rod I8 being held in position by a U-shapedwire clip 2li having at each of its ends a curved portion 2| forembracing the said rod. The U- shaped wire clips120, for embracing thelower of the rods I8, are disposed around the compres'- sible elementsII adjacent the bases of the tapered portions I4 thereof.

'Ihe wire clips 20 for the upper rods I8 are similar in shape to thosepreviously described and indicated by the same number, but in lieu ofembracing a compressible element in the manner previously described, areadapted to embrace raised portions 24 which are integrally formed on theupper surfaces of the horizontal extensions 8 which are carried by thecomplemental vertical extensions 5 of the base member I.

Extending between the adjacent faces'of the complemental verticalextensions 5 of a series of aligned base members I is a compressibleelement 26. In installation, a single compressible element 26 isdisposed to extend entirely across the roadway, and embodies cut-outportions 21 for straddling the mid-portions of the series of aligned andsuitably spaced base members I.

In order to initially secure the joint assemblies on a prepared subgradeso as to span the distance between the pavement lane forms, the remoteends of the extensions 2 of the base member I carry compressibleelements 30 having on their inner ends U-shaped staples 3|, the legs ofthe latter extending through` the compressible elements 30 and beingbent at right angles, as shown at 32. Adjacent the remote ends of theextensions 2, each is provided with a vertical aperture.

the width of the pavement in the manner of the compressible element 26.The compressible element 26 is generally composed of asphalt saturatedfelt, rubber, cork board or corn stalk composition, and is stffenedlongitudinally to withstand installation handling and the flow of thepoured concrete by the rods I8. These rods I8 also secure the pluralityof base members I (which, for example, may be ve in number extendingacross the pavement) in unit assembly with he compressible element 26.

After the pavement joint has been installed and the concrete or otherpaving material poured, the construction and arrangement is such thatwith a rise in temperature the adjacent slabs expand so as to move onthe-subgrade. This movement is unrestricted as the compressible element26 and mastic seal 38 are compressed. Similarly, the compressibleelements 30 at the remote ends of the extensions 22 of the base member Iare compressed. The compressible elem. its II on the remote sides of thevertical extensions 5 also provide for unrestricted movement of theadjoining portions of the pavement slabs, where otherwise the latterwould tend to shear the vertical uprights from the base member I. 'I'hecompressible elements II and the compressible element 26 permit thecomplemental vertical extensions 5 to bend or flex.

The expansion of the adjacent paving slabs breaks any initial bond whichmay take place between the said slabs and the exposed surface of thebase member I and its component elements, thus providing a ridingsurface for repeated cycles of movement of the slabs.

The function of the device of the present invention in transferring thetrafc load from the cnd of one paving slab to the next paving slab is asfollows:

As the trac load is established adjacent the end of one of the pavingslabs, there is established a compression force on the extension 2 whichis immediately therebelow. The rigidity and resistance of the basemember to bend across the distance equal to the thickness of thecompressible element 26 diverts this force into tension on the oppositecomplemental vertical extension 5, which in turn is securely bonded inthe opposite paving slab at its integrally formed horizontal extension8. As the traic load moves across the mastic seal 38 and on to the nextpaving slab, the forces are reversed in ccmplemental function.

While I have shown and described one specic embodiment of the presentinvention, it will be understood that I do not wish to be limitedexactly thereto, since various modifications may be made withoutdeparting -from the scope of the invention as defined by the appendedclaims.

I claim: 1. A joint for concrete. pavement and the like, comprising aunitary base member adapted to underlie .the joint and extend inopposite directions for a. substantial distance beneath each slab, apair of integral upright members carried by said base member so as toextend upwardly in substantial parallelism between the slab sectionsrespectively adjacent each of the end faces of the latter, the upperextremity of each upright member being turned to penetrate into itsrespectively proximate slab section in a substantially horizontaldirection, a compressible element at each of the oppositely extendedends of said base member, a compressible element between said uprightmembers, and a compressible element between each of said upright membersand the respectively proximate slab section.

2. A joint for concrete pavement and the like, comprising a unitary basemember adapted to underlie the joint and extend in opposite directionsfor a substantial distance beneath each slab, a pair o1' integralupright members carried by said base member so as to extend upwardly insubstantial parallelism between the slab sections respectively adjacenteach of the end faces of the latter, the upper extremity of each uprightmember being turned to penetrate into its respectively proximate slabsection in a substantially horizontal direction, a compressible elementbetween said upright members, a compressible element at each of theoppositely extended ends of said base member, a compressible elementbetween each of said upright members and the respectively proximate slabsection, and means for initially holding said base member in position.

3. A joint for concrete pavement and the like, comprising a unitary basemember adapted to underlie the 'joint and extend in opposite directionsfor a substantial distance beneath each slab, a pair of integral uprightmembers carried by said base member so as to extend upwardly insubstantial parallelism between the slab sections respectively adjacenteach of the end faces of the latter, the upper extremity of each uprightmember being turned to penetrate into its respectively prximate slabsection in a substantially horizontal direction, a compressible elementbetween said upright members, a compressible element at each of theoppositely extended ends of said base member, a compressible elementbetween each of said upright members and the respectively proximate slabsection, and means for holding said last-named compressible elements inposition.

4. A joint for concrete pavement and the like, comprising a unitary basemember adapted to underlie the joint and extend in opposite directionsfor a substantial distance beneath each slab, a pair of integral uprightmembers carried by said base member so as to extend upwardly insubstantial parallelism between the slab sections respectively adjacenteach of the end faces of the latter, the upper extremity of each uprightmember being turned to penetrate into its respectively proximate slabsection in a substantially horizontal direction, a compressible elementbetween said upright members, a compressible element at each of theoppositely extended ends of said base member, and a compressible elementbetween each of said upright members and the respectively proximate slabsection, said firstnamed compressible element extending substantiallythe entire width of the pavement.

5. A joint for concrete pavement and the like,

tively proximate slab section in a substantially l0 horizontaldirection, a compressible element between said upright members, acompressible` element at each of the oppositely extended ends ot saidbase member, a compressible element between each o! said upright membersand the respectively proximate slab section, and a rod carried by atleast one of said integral upright members and projecting from eitherside therof.

ALAN E. BRICKMAN.

